diff --git a/.changeset/hungry-wombats-compare.md b/.changeset/hungry-wombats-compare.md
new file mode 100644
index 0000000000..50d237e4c8
--- /dev/null
+++ b/.changeset/hungry-wombats-compare.md
@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Adding Soneium mainnet
diff --git a/site/pages/op-stack/chains.md b/site/pages/op-stack/chains.md
index 7f9220d909..b021fe5056 100644
--- a/site/pages/op-stack/chains.md
+++ b/site/pages/op-stack/chains.md
@@ -14,6 +14,7 @@ import {
   optimism, // [!code hl]
   optimismGoerli, // [!code hl]
   optimismSepolia, // [!code hl]
+  soneium, // [!code hl]
   soneiumMinato, // [!code hl]
   zircuit, // [!code hl]
   zircuitTestnet, // [!code hl]
diff --git a/src/chains/definitions/soneium.ts b/src/chains/definitions/soneium.ts
new file mode 100644
index 0000000000..f8a9d1e659
--- /dev/null
+++ b/src/chains/definitions/soneium.ts
@@ -0,0 +1,53 @@
+import { chainConfig } from '../../op-stack/chainConfig.js'
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+const sourceId = 1 // mainnet
+
+export const soneium = /*#__PURE__*/ defineChain({
+  ...chainConfig,
+  id: 1868,
+  name: 'Soneium Mainnet',
+  nativeCurrency: { name: 'Ether', symbol: 'ETH', decimals: 18 },
+  rpcUrls: {
+    default: {
+      http: ['https://rpc.soneium.org'],
+    },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Blockscout',
+      url: 'https://soneium.blockscout.com',
+      apiUrl: 'https://soneium.blockscout.com/api',
+    },
+  },
+  contracts: {
+    ...chainConfig.contracts,
+    disputeGameFactory: {
+      [sourceId]: {
+        address: "0x512a3d2c7a43bd9261d2b8e8c9c70d4bd4d503c0",
+      },
+    },
+    l2OutputOracle: {
+      [sourceId]: {
+        address: "0x0000000000000000000000000000000000000000",
+      },
+    },
+    portal: {
+      [sourceId]: {
+        address: "0x88e529a6ccd302c948689cd5156c83d4614fae92",
+        blockCreated: 7061266,
+      },
+    },
+    l1StandardBridge: {
+      [sourceId]: {
+        address: "0xeb9bf100225c214efc3e7c651ebbadcf85177607",
+        blockCreated: 7061266,
+      },
+    },
+    multicall3: {
+      address: "0xcA11bde05977b3631167028862bE2a173976CA11",
+      blockCreated: 1,
+    },
+  },
+  sourceId,
+})
diff --git a/src/chains/index.ts b/src/chains/index.ts
index 845206d4c0..f5819299bf 100644
--- a/src/chains/index.ts
+++ b/src/chains/index.ts
@@ -408,6 +408,7 @@ export { skaleTitanTestnet } from './definitions/skale/titanTestnet.js'
 export { sketchpad } from './definitions/sketchpad.js'
 export { snax } from './definitions/snax.js'
 export { snaxTestnet } from './definitions/snaxTestnet.js'
+export { soneium } from './definitions/soneium.js'
 export { soneiumMinato } from './definitions/soneiumMinato.js'
 export { sonic } from './definitions/sonic.js'
 export { sonicTestnet } from './definitions/sonicTestnet.js'
diff --git a/src/op-stack/chains.ts b/src/op-stack/chains.ts
index ec989271cf..d0caa8fc3f 100644
--- a/src/op-stack/chains.ts
+++ b/src/op-stack/chains.ts
@@ -17,6 +17,7 @@ export { pgnTestnet } from '../chains/definitions/pgnTestnet.js'
 export { shape } from '../chains/definitions/shape.js'
 export { snax } from '../chains/definitions/snax.js'
 export { snaxTestnet } from '../chains/definitions/snaxTestnet.js'
+export { soneium } from '../chains/definitions/soneium.js'
 export { soneiumMinato } from '../chains/definitions/soneiumMinato.js'
 export { unichainSepolia } from '../chains/definitions/unichainSepolia.js'
 export { worldchain } from '../chains/definitions/worldchain.js'